Many enzymes consist of a protein and a non-protein (called the cofactor). The proteins in enzymes are usually globular. The intra- and intermolecular bonds that hold proteins in their secondary and tertiary structures are disrupted by changes in temperature and pH. This affects shapes and so the catalytic activity of an enzyme is pH and temperature sensitive.
Everyday in the U.S. millions of cars and trucks idle needlessly, sometimes for hours. You may not be able to avoid keeping your engine running when youâre stopped at a traffic signal or stuck in slow-moving traffic. But other times idling is unnecessary. An idling car can release as much pollution as a moving car.
The engine and charging system will work much better under load, while driving. Just idling the car for 20 minutes will not provide as good a charge as actually driving the car for 20 minutes. It will take about 20 minutes of driving to charge your battery. That is why short trips wear batteries out, they never get back up to full charge and the drain from starting the car doesn't get replaced.